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2026 Vol.59, Issue 2 Preview Page

Special Issue: 지능형 도시홍수 예측

Experimental study on the hydraulic performance of permeable block systems with joints

지속가능한 배수시스템 포장의 줄눈 여부에 따른 배출성능에 대한 실험적 검증

Seongil Yeoma
,
Jungkyu Ahnb*
,
Jeongmin Leec
염 성일a
,
안 정규b*
,
이 정민c
aPh.D. Candidate, Department of Civil and Environmental Engineering, Incheon National University, Incheon, Korea
bProfessor, Department of Civil and Environmental Engineering, Incheon National University, Incheon, Korea
cPh.D. Candidate, Department of Civil and Environmental Engineering, Incheon National University, Incheon, Korea
a인천대학교 건설환경공학과 박사과정
b인천대학교 건설환경공학과 교수
c인천대학교 건설환경공학과 박사과정
*Corresponding Author
28 February 2026. pp. 225-231
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Abstract

The expansion of impervious surfaces caused by urbanization has intensified urban flooding, revealing the hydraulic limitations of conventional urban drainage systems (CUDs). As an alternative, sustainable urban drainage systems (SUDs) have been introduced, among which infiltration-type drainage systems (IRDs) are regarded as an effective solution for flood mitigation and hydrological restoration. This study experimentally investigated the hydraulic role of joints in permeable block systems by comparing the discharge and permeability under two configurations: Combined (with joints) and Single (without joints). Constant-head tests were conducted using five samples. The average discharge under the Combined condition was 2.82×10-5 m3/s, approximately 9 % higher than that under the Single condition (2.59×10-5 m3/s). The standard deviation and variance decreased by 38 % and about threefold, respectively, indicating improved discharge stability and reproducibility. The mean hydraulic conductivities were similar between conditions (6.39 × 10-4 m/s and 6.47 ×10-4 m/s). However, samples 2 and 5 in the Single case exhibited greater variability, suggesting localized clogging when joints were absent. These findings demonstrate that joints function not only as drainage paths but also as key structural elements that ensure hydraulic stability within IRDs. Furthermore, the results provide quantitative evidence of the role of joints in promoting flow uniformity and can serve as fundamental data for the design optimization and long-term performance evaluation of infiltration-type drainage systems.

Keywords
Infiltration urban drainage systems
Permeable block
Hydraulic conductivity
Urban flooding
Joint permeability

도시화로 인한 불투수면적의 확장은 도시 홍수를 가중시키며, 이에 따라 기존 전통적 배수시스템(Conventional Urban Drainage Systems, CUDs)의 수리적 한계가 지적되고 있다. 이러한 문제를 해결하기 위한 대안으로 지속가능한 도시배수시스템(Sustainable Urban Drainage Systems, SUDs)이 도입되고 있으며, 그중 침투형 배수시스템(Infiltration-type Drainage Systems, IRDs)은 도시 물순환 회복과 홍수 저감에 효과적인 기술로 평가된다. 본 연구는 IRDs의 핵심 구성 요소인 투수블록과 줄눈(joint)의 수리학적 기능을 규명하기 위해, 줄눈 유무에 따른 유출 특성과 투수 성능을 실내 정수두 실험을 통해 정량적으로 비교·분석하였다. 실험은 총 5개의 시료를 Combined(줄눈 포함) 및 Single(줄눈 제외) 조건으로 구분하여 수행하였다. 그 결과, Combined 조건의 평균 유출량은 2.82×10-5 m3/s로 Single 조건(2.59×10-5 m3/s) 대비 약 9 % 높게 나타났으며, 표준편차와 분산은 각각 38 % 및 약 3 배 감소하여 유출 안정성과 재현성이 향상되었다. 평균 투수계수는 Combined 6.39×10-4 m/s, Single 6.47×10-4 m/s로 유사하였으나, Single 조건에서는 Sample 2와 5에서 변동성이 뚜렷이 증가하여 줄눈 차단에 따른 국부적 막힘(clogging) 현상이 확인되었다. 이러한 결과는 줄눈이 단순한 배수 통로를 넘어 유출 안정성(hydraulic stability)과 유동 균질성(flow uniformity)을 유지하는 핵심 구조요소임을 실험적으로 입증한 것이다. 본 연구의 결과는 향후 IRD 설계 및 장기 성능평가를 위한 기초 자료로 활용될 수 있으며, 향후 인공강우 실험과 3차원 수치해석을 통해 줄눈 구조 최적화와 막힘 저항성 향상을 규명할 필요가 있다.

키워드
침투형 도시 배수시스템
투수블록
투수계수
도시홍수
줄눈 투수계수
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 59
  • No :2
  • Pages :225-231
  • Received Date : 2025-07-31
  • Revised Date : 2025-12-17
  • Accepted Date : 2025-12-19
  • DOI :https://doi.org/10.3741/JKWRA.2026.59.2.225
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